TypeScript Recipes vs Learn Lua

Tap Run and the real output appears right under the code, along with any type errors. You know what the code does before it goes into your project. No Node.js or TypeScript to install, no IDE, no account. 360+ short examples, one task each. Over 90% run on Node.js 24 and pass strict TypeScript 7 type checking. You know what you need, but not the exact syntax: • How do I remove duplicates from an array? • How do I get an enum value from its name? • How do I merge two Maps? Each has a working example here. • 22 sections, including strings and dates, arrays and collections, classes and interfaces, enums, generics, arrow functions, async/await, exception handling, regular expressions, files, JSON, algorithms, and design patterns. • What changed from TypeScript 3.0 to 5.5, with before-and-after code: the unknown type, the ?. and ?? operators, template literal types, the satisfies operator, using declarations. • Reference, 120+ entries: keywords, operators, and utility types such as Partial, Pick, Record, and ReturnType. Tap a word in the code to look it up. • 200+ SQL queries: JOIN, GROUP BY, subqueries, window functions; more than half run on a practice database. • Search looks inside the code: type reduce to find every example that uses it. • Edit an example and run your version, or write your own: a type error shows up right away. • Works on iPhone, iPad, and Mac. • Everything except running code works offline. Free version: 190+ TypeScript examples and 120+ SQL queries, the full reference, and 12 runs and 12 edits a day (TypeScript and SQL runs share one limit). Full version: all examples and queries, unlimited edits and examples of your own, and up to 30 TypeScript and 80 SQL runs a day. One-time purchase, no subscription. Built by a developer for developers. The project behind it has been in active development since 2015.

Learn Lua — the beginner-friendly language behind Roblox scripting (Luau), game mods and countless tools. Write and run real Lua code on your phone, with bite-sized lessons, quizzes and an AI mentor that explains every error in plain English. Heads up: this is a Lua LANGUAGE course, not a Roblox game builder — you'll learn the real coding skills that game scripting is built on. WHY LEARN LUA? • Roblox scripts are written in Luau, a language built on Lua — learning Lua is step one to scripting your own games • Lua also powers World of Warcraft addons, Garry's Mod, Neovim plugins and embedded software • Lua is one of the easiest first programming languages: small, clean and forgiving • The concepts you learn here (variables, loops, functions, tables) transfer to every other language you'll ever touch WHAT YOU'LL LEARN • Lua basics — variables, types, math and strings • Control flow — if/else, loops and logic • Functions and scope • Tables — Lua's superpower — plus metatables • Object-oriented programming in Lua • Error handling and practical scripts you can actually use • Practice projects — mini scripts that feel like game logic EVERYTHING YOU NEED TO LEARN LUA • AI Mentor — confused by a lesson or an error message? Ask anything and get a clear answer in seconds • 100+ bite-sized lessons (5–10 minutes each) • Real code editor — write and run Lua code right on your phone • Quizzes and coding challenges after every topic • Weekly Code Challenge — compete with learners around the world • Certificate of completion — pass the final exam and show off your skills • Streaks and progress tracking to keep you coding every day • App available in 22 languages WHO IT'S FOR • Roblox players who want to go from playing games to scripting them • Complete beginners (young or grown) picking their first language • Modders and tinkerers who keep bumping into Lua SETTING EXPECTATIONS (the honest part) This app teaches the Lua programming language with lessons, practice and a code editor. It does not include Roblox Studio, game assets or a game engine — to publish a Roblox game you'll use Roblox Studio on a computer, and the Lua skills you build here are exactly what you'll need when you get there. Not affiliated with Roblox Corporation. Part of CoddyKit — a family of 40+ coding apps trusted by 100,000+ learners worldwide. Free to start: your first course is free, with a daily AI Mentor allowance. Pro unlocks every course, removes ads and gives you unlimited AI Mentor. Download now and write your first script today. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://www.coddykit.com/terms/privacy-policy